US9270069B2 - Angled electrical contactor - Google Patents
Angled electrical contactor Download PDFInfo
- Publication number
- US9270069B2 US9270069B2 US14/242,961 US201414242961A US9270069B2 US 9270069 B2 US9270069 B2 US 9270069B2 US 201414242961 A US201414242961 A US 201414242961A US 9270069 B2 US9270069 B2 US 9270069B2
- Authority
- US
- United States
- Prior art keywords
- contact
- bar
- contact bar
- disc
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 239000004020 conductor Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005494 tarnishing Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R41/00—Non-rotary current collectors for maintaining contact between moving and stationary parts of an electric circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/28—Contacts for sliding cooperation with identically-shaped contact, e.g. for hermaphroditic coupling devices
Definitions
- This disclosure relates generally to electrical contactors, and more specifically to an angled electrical contactor.
- Low current electrical contactors may be found in various electrical systems, for example, motor starters.
- a moving contact bar 101 is positioned above a left stationary contact bar 102 and a right stationary contact bar 103 .
- the three contact bars 101 , 102 , and 103 comprise respective contact discs 105 A-B, 104 A, and 104 B.
- the contact discs are attached to the contact bars, and positioned so that the contact discs on the stationary contact bars 102 and 103 are directly opposed to corresponding contact discs on the moving contact bar 101 .
- contact disc 105 A approaches and touches contact disc 104 A
- contact disc 105 B approaches and touches contact disc 104 B
- closing a circuit between stationary contact bars 102 and 103 so that a current enters stationary contact bar 102 from current input 108 and flows through moving contact bar 101 to stationary contact bar 103 , and exits stationary contact bar 103 via current output 109 .
- the moving contact bar 101 is mechanically driven upwards and downwards by an actuating device 107 , which transmits motion to the moving contact bar 101 through a spring 106 .
- one pair of contact discs e.g., 104 A and 105 A
- the other pair e.g., 104 B and 105 B
- the spring 106 may provide part of this flexibility.
- the current is constricted as it flows through the points where the contact disc pairs 104 A/ 105 A and 104 B/ 105 B touch each other. This constriction generates a magnetic force proportional to the square of the current, which acts to drive the contact discs pairs 104 A/ 105 A and 104 B/ 105 B apart. This force may be referred to as the blow-apart force.
- the currents in electrical contactor 100 may exceed a rated current level of the electrical contactor 100 .
- the current is highly concentrated at each point of contact between the contact disc pairs, which may generate a correspondingly large blow-apart force at the point of contact.
- the spring 106 and the actuating device 107 must provide a closing force substantially greater than the total blow-apart force during a worst-case fault event. Otherwise, high currents may cause the metal that comprises the contact discs to melt at the point of contact, welding the contacts discs together.
- An aspect includes a moving contact bar, the moving contact bar comprising at least 4 contact discs, wherein a first contact disc and a second contact disc of the moving contact bar are located in a first plane, and a third contact disc and a fourth contact disc of the moving contact bar are located in a second plane, wherein the first plane and the second plane are distinct and are at an angle to each other.
- Another aspect includes a first stationary contact bar, the first stationary contact bar comprising at least 2 contact discs, wherein a first contact disc of first stationary contact bar is in a third plane, the third plane being substantially parallel to the first plane, and a second contact disc of the first stationary contact bar is in a fourth plane, the fourth plane being substantially parallel to the second plane.
- Embodiments of a method of operating angled electrical contactor are provided.
- An aspect includes moving a moving contact bar towards a first stationary contact bar, the moving contact bar comprising at least 4 contact discs, wherein a first contact disc and a second contact disc of the moving contact bar are located in a first plane, and a third contact disc and a fourth contact disc of the moving contact bar are located in a second plane, wherein the first plane and the second plane are distinct and are at an angle to each other.
- first stationary contact bar comprising at least 2 contact discs, wherein a first contact disc of first stationary contact bar is in a third plane, the third plane being substantially parallel to the first plane, and a second contact disc of the first stationary contact bar is in a fourth plane, the fourth plane being substantially parallel to the second plane.
- Another aspect includes based on the moving of the moving contact bar towards the first stationary contact bar, contacting the first contact disc of the moving contact bar to the first contact disc of the first stationary contact bar, and contacting the third contact disc of the moving contact bar to the second contact disc of the first stationary contact bar.
- FIG. 1 illustrates an embodiment of a prior art electrical contactor.
- FIG. 2A illustrates an embodiment of an angled electrical contactor.
- FIG. 2B illustrates a side view of the angled electrical contactor of FIG. 2A .
- FIG. 3 illustrates an embodiment of a single-pole double-throw contactor comprising an angled electrical contactor.
- FIG. 4 illustrates another embodiment of an angled electrical contactor.
- FIG. 5 illustrates an embodiment of a single-pole double-throw contactor comprising an angled electrical contactor.
- Embodiments of an angled electrical contactor are provided, with exemplary embodiments being discussed below in detail.
- Electrical contactors that are rated for use in high current applications may provide more than one parallel path for the current. Dividing the current among two or more parallel paths reduces the blow-apart force, and also reduces the likelihood of a welding event during a fault. Because each path carries only half of the current during a fault event, the blow-apart force per path where the contact discs touch is reduced by a factor of four, and the closing force required from the actuating device and the spring is reduced by a factor of two.
- the moving contact bar may be made wider to accommodate two contact discs at each end; the stationary contact bar(s) are also made wider to include contact discs corresponding to the contact discs on the moving contact bar.
- the moving contact bar may be configured such that the contact discs at each end are at an angle to one another, with the contact discs on the stationary contact bars configured at a corresponding angle. In such an angled configuration, when three of the contact disc pairs are in contact with one another, it is still possible to maneuver the moving contact bar so that the fourth contact disc pair comes into contact.
- FIG. 2A shows an embodiment of an angled electrical contactor 200 .
- the angled electrical contactor 200 comprises a moving contact bar 201 that is moved towards and away from stationary contact bars 102 and 103 by an actuating device 207 and a spring 206 .
- the angled electrical contactor 200 provides two parallel current paths; the first through contact disc pairs 205 A/ 204 A and 205 C/ 204 C, and the second through contact discs pairs 205 B/ 204 B and 205 D/ 204 D.
- the four contact discs 205 A-D on the moving contact bar 201 are not all in the same plane; rather, contact discs 205 A and 205 C are in a first plane, and contact discs 205 B and 205 D are in a second plane that is at an angle to the first plane.
- the two stationary contact bars 202 and 203 also have their respective contact discs 204 A-D arranged in two planes that are at an angle to each other corresponding to the angle between the first and second planes on the moving contact bar 201 ; e.g., contact disc 204 A and contact disc 204 C are in a third plane that is substantially parallel to the first plane, and contact disc 204 B and contact disc 204 D are in a fourth plane that is substantially parallel to the second plane.
- the actuating device 207 moves the moving contact bar 201 via spring 206 upwards to put the angled electrical contactor 200 in the off position, and downwards to put the angled electrical contactor 200 in the on position.
- current is input to the angled electrical contactor 200 via stationary contact bar 202 via current input 208 , flows through from stationary contact bar 202 to moving contact bar 201 via contact discs 204 A-B and 205 A-B, from moving contact bar 201 to stationary contact bar 203 via contact discs 204 C-D and 205 C-D, and out of stationary contact bar 203 via current output 209 .
- Angled electrical contactor 200 allows the moving contact bar 201 to move in four degrees of freedom (vertical, roll, pitch, and yaw), to achieve good contact between the contact discs 205 A-D on moving contact bar 201 and contact discs 204 A-D on stationary contact bars 202 and 203 . Even if manufacturing tolerances prevent all four disc pairs from touching on the initial descent, there are three degrees of freedom remaining for moving contact bar 201 to move to allow all remaining disc pairs to touch.
- the moving contact bar 201 may have some flexibility, so that the contact bar 201 can pivot to utilize roll, pitch, and yaw movement.
- a plurality of springs may be included in an angled electrical contactor instead of the single spring 206 shown in FIG. 2 .
- the actuating device 207 provides the holding force between the moving contact bar 201 and stationary contact bars 202 and 203 when the angled electrical contactor is in the on position (i.e., is conducting current), and may be any appropriate actuating mechanism, for example, an electric solenoid, a manually operated lever, a cam and roller, or a pneumatic cylinder, in various embodiments.
- the actuating device 207 may travel a fixed distance, somewhat greater than the separation between the moving contact bar 201 and the stationary contact bars 202 and 203 . The excess travel acts to compress the spring 206 , which is dimensioned to provide a holding force on the moving contact bar 201 .
- Each of the four contact discs 205 A-D is therefore pressed against the opposing contact discs 204 A-D with more than one-fourth of the holding force from the spring 206 .
- the total force between the opposing contact discs is greater than the holding force.
- the contact bars 201 - 203 may be made from a metal with a relatively low electrical resistance, such as copper, in some embodiments.
- the contact discs 204 A-D and 205 A-D may be made from a metal that resists tarnishing, such as silver or cadmium, in some embodiments. In other embodiments, the contact discs 204 A-D and 205 A-D may be made from a metal with a relatively high melting point, such as tungsten.
- FIG. 2B shows a side view of the angled electrical contactor 200 that shows the points where the contact discs 204 A and 205 A on moving contact bar 201 , and contact discs 204 B and 205 B on stationary contact bar 202 , contact each other when the angled electrical contactor 200 is conducting current.
- the contact discs 204 A-B and 205 A-B as shown in FIG. 2 have a slightly domed or convex surface, which causes the contact point to be near the center of the discs.
- Angle 210 is the angle between the plane surface containing contact disc 205 A and the place surface containing contact disc 205 B on the moving contact bar 201 . Angle 210 is shown as 90° degrees in FIG.
- angle 210 may be any angle that is greater than 0° but less than 180°. In some embodiments, angle 210 is between about 60° and 120°.
- contact disc 204 A On stationary contact bar 202 , contact disc 204 A is in a plane that is at an angle 211 with respect to the plane containing contact disc 204 B. Angle 211 corresponds to angle 210 and is approximately equal to 360° minus angle 210 . In an embodiment in which angle 210 is about 90°, the moving contact bar 201 must travel about 41% farther, as compared to an embodiment comprising flat moving and stationary contact bars, to achieve the same contact gap when the angled electrical contactor 200 is in the off position.
- the total closing force between the contact discs 204 A-D and 205 A-D is 41% greater than the force from spring 206 in such an embodiment, due to the wedging effect.
- This increased closing force improves the ability of the angled electrical contactor 200 to avoid welding.
- the angle 210 is more acute, the extra travel that is required and the extra force that is generated both increase.
- Further embodiments of angled electrical contactors that incorporate a moving contact bar that is angled similarly to moving contact bar 201 of FIGS. 2A-B , and one or more stationary contact bars that are angled similarly to stationary contact bars 202 - 203 , are discussed below with respect to FIGS. 3-5 .
- FIG. 3 illustrates an embodiment of a single-pole double-throw contactor 300 comprising an angled electrical contactor as shown in FIGS. 2A-B .
- single-pole double-throw contactor 300 there are four stationary contact bars, 302 and 303 below, and 312 and 313 above.
- the moving contact bar 301 has four separate plane surfaces, each plane surface comprising two respective contact discs of contact discs 305 A-H.
- a first plane containing contact discs 305 A-B is at an angle with respect to a second plane containing contact discs 305 G-H;
- a third plane containing contact discs 305 C-D is at approximately the same angle with respect to a fourth plane containing contact discs 305 E-F.
- the first and third planes are substantially parallel, as are the second and fourth planes.
- the four stationary contact bars 302 , 303 , 312 , and 313 each have two respective contact discs 304 A-B, 304 C-D, and 314 A-B, and 314 C-D; on each stationary contact bar 302 , 303 , 312 , and 313 , the contact discs are mounted on two different planes that are substantially parallel to the plane surfaces of the moving contact bar 301 that contact the particular stationary contact bar.
- the moving contact bar 301 closes the circuit between stationary contact bars 302 and 303 , and current flows from current input 308 through stationary contact bars 302 and 303 via moving contact bar 301 , through contacts discs 304 A-D and contact discs 305 C-F, to current output 309 .
- the moving contact bar 301 When the actuating device 307 drives the moving contact bar 301 upwards via spring 306 towards stationary contact bars 312 and 313 , the moving contact bar 301 closes the circuit between stationary contact bars 312 and 313 , and current flows from current input 310 through stationary contact bars 312 and 313 via moving contact bar 301 , through contacts discs 314 A-D and contact discs 305 A-B and 305 G-H, to current output 311 .
- the actuating device 307 is configured to be capable of generating the same amount force in both the downwards and upwards directions.
- FIG. 4 shows another embodiment of an angled electrical contactor 400 .
- the angled electrical contactor 400 comprises a moving contact bar 401 moved upwards and downwards by actuating device 407 and spring 406 .
- the angled electrical contactor 400 provides four parallel current paths; the first through contact disc pair 404 A/ 405 A, the second through contact disc pair 404 B/ 405 B, the third through contact disc pair 404 C/ 405 C, and the fourth through contact disc pair 404 D/ 405 D.
- the four contact discs 405 A-D on the moving contact bar 401 are not all in the same plane; rather, contact discs 405 A and 405 C are in a first plane, and contact discs 405 B and 405 D are in a second plane that is at an angle to the first plane.
- the stationary contact bar 402 also has contact discs 404 A-D arranged in two planes that are at an angle to each other that corresponds to the angle of the contacts discs 405 A-D on the moving contact bar 401 .
- the actuating device 407 moves the moving contact bar 401 upwards via the spring 406 to put the angled electrical contactor 400 in the off position, and downwards to put the angled electrical contactor 400 in the on position.
- Flexible conductor 410 inputs current to the angled electrical contactor 400 .
- FIG. 4 is shown for illustrative purposes only; in some embodiments, current may be input to the stationary contact bar, and output by the moving contact bar.
- FIG. 5 illustrates an embodiment of a single-pole double-throw contactor 500 comprising an angled electrical contactor as shown in FIG. 4 .
- single-pole double-throw contactor 500 there are two stationary contact bars, 502 below, and 503 above.
- the moving contact bar 501 has four separate plane surfaces, each plane surface comprising two respective contact discs of contact discs 505 A-H.
- a first plane containing contact discs 505 A-B is at an angle with respect to a second plane containing contact discs 505 G-H; a third plane containing contact discs 505 C-D is at approximately the same angle with respect to a fourth plane containing contact discs 505 E-F.
- the two stationary contact bars 502 and 503 each have four respective contact discs 504 A-D and 514 A-D on each stationary contact bar, the contact discs are mounted on two planes are at an angle that corresponds to the above-listed planes on moving contact bar 501 .
- Moving contact bar 501 is moved upwards and downwards via spring 506 and an actuating device such as actuating device 307 that was shown in FIG. 3 .
- Flexible conductor 511 supplies current to the single-pole double-throw contactor 500 .
- FIG. 5 is shown for illustrative purposes only; in some embodiments, current may be input to the stationary contact bars, and output from the moving contact bar via the flexible conductor.
- the technical effects and benefits of exemplary embodiments include provision of parallel current paths and good, substantially simultaneous electrical contact in an electrical contactor.
- the total closing force on all pairs of contact discs exceeds the force applied by the actuating device and the spring.
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Abstract
Description
Claims (20)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/242,961 US9270069B2 (en) | 2014-04-02 | 2014-04-02 | Angled electrical contactor |
CN201510319321.2A CN105140074B (en) | 2014-04-02 | 2015-04-02 | Tilt electric contactor |
US14/971,065 US9525259B2 (en) | 2014-04-02 | 2015-12-16 | Electrical contactor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/242,961 US9270069B2 (en) | 2014-04-02 | 2014-04-02 | Angled electrical contactor |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/971,065 Continuation-In-Part US9525259B2 (en) | 2014-04-02 | 2015-12-16 | Electrical contactor |
Publications (2)
Publication Number | Publication Date |
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US20150288122A1 US20150288122A1 (en) | 2015-10-08 |
US9270069B2 true US9270069B2 (en) | 2016-02-23 |
Family
ID=54210566
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Application Number | Title | Priority Date | Filing Date |
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US14/242,961 Active 2034-04-10 US9270069B2 (en) | 2014-04-02 | 2014-04-02 | Angled electrical contactor |
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US (1) | US9270069B2 (en) |
CN (1) | CN105140074B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160104992A1 (en) * | 2014-04-02 | 2016-04-14 | Siemens Aktiengesellschaft | Electrical contactor |
US20160302321A1 (en) * | 2014-04-29 | 2016-10-13 | Bretford Manufacturing, Inc. | Recessed Power System |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3553633A (en) * | 1966-02-28 | 1971-01-05 | Albert A Ondrejka | Multi-contact separable electrical connector |
US4995824A (en) * | 1989-10-23 | 1991-02-26 | Cabot Corporation | Line coupling device |
US5071363A (en) * | 1990-04-18 | 1991-12-10 | Minnesota Mining And Manufacturing Company | Miniature multiple conductor electrical connector |
US5176530A (en) * | 1990-04-18 | 1993-01-05 | Minnesota Mining And Manufacturing Company | Miniature multiple conductor electrical connector |
US5664953A (en) * | 1994-07-25 | 1997-09-09 | Minnesota Mining And Manufacturing Co. | Elastomeric locking taper connector with randomly placeable intermeshing member |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2265588Y (en) * | 1995-07-20 | 1997-10-22 | 朱国华 | Alarm contactor |
-
2014
- 2014-04-02 US US14/242,961 patent/US9270069B2/en active Active
-
2015
- 2015-04-02 CN CN201510319321.2A patent/CN105140074B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3553633A (en) * | 1966-02-28 | 1971-01-05 | Albert A Ondrejka | Multi-contact separable electrical connector |
US4995824A (en) * | 1989-10-23 | 1991-02-26 | Cabot Corporation | Line coupling device |
US5071363A (en) * | 1990-04-18 | 1991-12-10 | Minnesota Mining And Manufacturing Company | Miniature multiple conductor electrical connector |
US5176530A (en) * | 1990-04-18 | 1993-01-05 | Minnesota Mining And Manufacturing Company | Miniature multiple conductor electrical connector |
US5664953A (en) * | 1994-07-25 | 1997-09-09 | Minnesota Mining And Manufacturing Co. | Elastomeric locking taper connector with randomly placeable intermeshing member |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160104992A1 (en) * | 2014-04-02 | 2016-04-14 | Siemens Aktiengesellschaft | Electrical contactor |
US9525259B2 (en) * | 2014-04-02 | 2016-12-20 | Siemens Aktiengesellschaft | Electrical contactor |
US20160302321A1 (en) * | 2014-04-29 | 2016-10-13 | Bretford Manufacturing, Inc. | Recessed Power System |
US10285297B2 (en) * | 2014-04-29 | 2019-05-07 | Bretford Manufacturing, Inc. | Recessed power system |
Also Published As
Publication number | Publication date |
---|---|
CN105140074A (en) | 2015-12-09 |
US20150288122A1 (en) | 2015-10-08 |
CN105140074B (en) | 2019-06-14 |
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